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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.utils.properties;
import java.util.Properties;
/**
* Properties with an optional specialization (e.g., session name, controller name).
*/
public class SpecProperties extends Properties {
private static final long serialVersionUID = 1L;
/**
* The property prefix, ending with ".".
*/
private final String prefix;
/**
* The specialized property prefix, ending with ".".
*/
private final String specPrefix;
/**
* Constructor.
*
* @param prefix the property name prefix that appears before any specialization, may
* be ""
* @param specialization the property name specialization (e.g., session name)
*/
public SpecProperties(String prefix, String specialization) {
this.prefix = withTrailingDot(prefix);
this.specPrefix = withTrailingDot(this.prefix + specialization);
}
/**
* Constructor.
*
* @param prefix the property name prefix that appears before any specialization, may
* be ""
* @param specialization the property name specialization (e.g., session name)
* @param props the default properties
*/
public SpecProperties(String prefix, String specialization, Properties props) {
super(props);
this.prefix = withTrailingDot(prefix);
this.specPrefix = withTrailingDot(this.prefix + specialization);
}
/**
* Adds a trailing "." to a String, if it doesn't already have one.
*
* @param text text to which the "." should be added
* @return the text, with a trailing "."
*/
private static String withTrailingDot(String text) {
return text.isEmpty() || text.endsWith(".") ? text : text + ".";
}
/**
* Gets the property whose value has the given key, looking first for the specialized
* property name, and then for the generalized property name.
*
* @param key property name, without the specialization
* @return the value from the property set, or {@code null} if the property set does
* not contain the value
*/
@Override
public String getProperty(String key) {
if (!key.startsWith(prefix)) {
return super.getProperty(key);
}
String suffix = key.substring(prefix.length());
String val = super.getProperty(specPrefix + suffix);
if (val != null) {
return val;
}
return super.getProperty(key);
}
protected String getPrefix() {
return prefix;
}
protected String getSpecPrefix() {
return specPrefix;
}
@Override
public final int hashCode() {
throw new UnsupportedOperationException("SpecProperties cannot be hashed");
}
@Override
public final boolean equals(Object obj) {
throw new UnsupportedOperationException("cannot compare SpecProperties");
}
}
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